Kanchanaburiassus, Dai, Wu, Dietrich, Christopher H. & Zhang, Yalin, 2015

Dai, Wu, Dietrich, Christopher H. & Zhang, Yalin, 2015, A review of the leafhopper tribe Hyalojassini (Hemiptera: Cicadellidae: Iassinae) with description of new taxa, Zootaxa 3911 (1), pp. 1-142 : 27-28

Kanchanaburiassus gen. nov.

Type species: Kanchanaburiassus maculatus sp. nov.

Dull stramineous with minute black spots on head, pronotum, and base of forewing, and larger, symmetrical dark markings ( Fig. 2 G, H). Body robust, weakly depressed. Head in dorsal view much narrower than pronotum, in dorsal view narrower medially than next to eyes; crown not developed ( Fig. 2 G), face evenly convex in profile ( Fig. 2 H); vertex and frontoclypeus transversely rugose; face slightly broader than tall; gena broadly rounded, concavely emarginate below eye; rostrum slender, not surpassing front trochanter; anteclypeus flat, constricted basally, broadened distally, apex truncate, even with lower margin of gena; lorum moderately broad, well separated from lateral and ventral margins of gena, with slightly more than basal half of mesal margin bordering frontoclypeus; frontoclypeus convex; antennal ledge well developed, oblique; lateral frontal suture absent; ocellus large, slightly mesad of antennal pit, equidistant from eye and midline and closer to antennal pit than to dorsal margin of vertex; antenna shorter than half width of head. Pronotum strongly convex, transversely rugose; lateral margins long, strongly carinate, evenly divergent posterad ( Fig. 2 G). Exposed part of mesonotum and scutellum together distinctly shorter than pronotum, glabrous; scutellar suture arched anterad, scutellum weakly convex with apex acuminate. Forewing venation distinct; membrane hyaline except with semiopaque sclerotization in basal half; setae absent; appendix broad, extended to wing apex, narrower than inner apical cell; vein R with 6 branches; three closed anteapical cells present; apical cells 1–4 long, parallel-sided, apical cell 4 longer than 3; posterior branch of CuA connected to wing margin at apex of clavus; inner apical cell long and broad, texture same as in adjacent cells; clavus truncate, claval veins parallel, weakly curved distally ( Fig. 2 G, H). Front femur with pair of dorsoapical macrosetae; AM setae undifferentiated; intercalary row with poorly differentiated setae arranged in irregular band; AD with numerous poorly differentiated setae throughout length; tibia flat and bicarinate dorsally, row PD with 4–5 enlarged setae, AD with enlarged distal seta and numerous smaller setae toward base. Mesothoracic femur with pair of dorsoapical setae and several smaller dorsal setae more basad; tibia AD and PD as on front leg. Hind femur macrosetae 2+1+1 or 2+2+1+1, setae subequal in size; tibial rows PD, AD, and AV with approximately 19, 13, and 15 macrosetae, respectively; tarsomere I without enlarged dorsoapical setae; plantar surface bare except anterior band and posterior row of short setae near apex; pecten with 4–5 platellae.

Male abdominal apodemes poorly developed; laterotergites III–VII enlarged, lamelliform, overlapping each other from front to back; sternite VIII ca. 1.6 timies longer than sternite VII, approximately as long as broad, posterior margin semicircular. Genital capsule with ventral part almost completely concealed by sternite VIII in repose with only anal tube and part of posterior pygofer margin visible. Pygofer with tergite long, well sclerotized, weakly emarginate distally in dorsal view; with posterodorsal group of several long macrosetae and sparse band of short, stout setae closer to posterior margin; accessory lobe absent; basolateral setal group absent; anterodorsal margin in lateral view emarginate along intersegmental membrane; posterior margin long and weakly convex, without short partially articulated basoventral process; intersegmental membrane between anal tube and atrium of aedeagus partially sclerotized, without setae ( Fig. 18 A, C). Subgenital plates absent ( Fig. 18 C). Valve short, broad, broadly fused to pygofer at base, posterior margin with broad angulate cleft extended nearly to base of segment ( Fig. 18 C). Connective large, Y-shaped, stem and anterior arms broad ( Fig. 18 B). Style well developed, articulated to connective adjacent to aedeagal atrium, apodeme very short, apophysis extremely elongate, slender, rugose, extended well beyond pygofer, apex acute, without preapical projections ( Fig. 18 B, C). Aedeagus with preatrium absent, atrium not expanded, with large dorsal process and tubular, ventral gonopore-bearing shaft bearing pair of apical spines; gonopore apical ( Fig. 18 B, D, E). Female unknown.

Notes. This is the only Old World genus of Iassinae known to lack subgenital plates. The Neotropical iassine genus Donleva Blocker also lacks subgenital plates, but differs in having much smaller styles and in lacking lamelliform abdominal laterotergites. Although the lamelliform pregenital laterotergites of the only known male of the genus resemble those of the related genus Lamelliassus , substantial differences in the male genitalia of Kanchanaburiassus , including the absence of subgenital plates and lack of a pygofer appendage, justify placing the species described below in a separate genus. The genus name, a masculine noun, was formed by combining the name of the type locality of the type species, Kanchanaburi province, with Iassus , the type genus of the subfamily.

Figures

FIGURE 2. Dorsal and lateral habitus. A, B, Decliviassus bipunctatus sp. nov.; C, D, Decliviassus maculatus sp. nov.; E, F, Decliviassus nudus sp. nov.; G, H, Kanchanaburiassus maculatus sp. nov.

FIGURE 18. Kanchanaburiassus maculatus sp. nov. A. Genital capsule, lateral view; B. Aedeagus and style, ventral view; C. Pygofer, ventral view; D. Aedeagus, ventral view; E. Aedeagus and connective, lateral view.